Grinding-mill.



No. 689,034. Patented Dec. I7, 1901!. J. BEBCHA & W. l. CHAPMAN.

GRINDING MILL.

(Application filed Mar. 22, 1900.)

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GRINDING MILL.

(Application filed Mar. 22, 1900.)

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JOSEPH BERCHA AND \VASHINGTON I. CHAPMAN, OF ATKINSON,

NEBRASKA.

GRINDING MILL.

SPEGIFICATIQN forming part of Letters Patent No. 689,034, dated December17, 1901- Application filed March 22, 1900. Serial No. 9,749. (Nomodel.)

To all whom it may concern:

Be it known-that we, J OSEPH BERGHA and WASHINGTON I. CHAPMAN, citizensof the United States, residing at Atkinson, in the county of Holt andState of Nebraska, have invented new and useful Improvements inGrinding-Mills, of which the following is a specification.

This invention relates to new and useful improvementsinmachinesforgrindinggrain; and its primary object is to provide a device of thischaracter which is simple in construction and effective in use, which isadapted to produce a coarse or fine product, and having grinding-rollersof such construction whereby clogging and heating of'the grain duringthe process of grinding are prevented.

To these ends the invention consists in providing a device having twovertical compartments separated by a removable partition, eachcontaining a roller, to which is detachably secured a cylindrical caseor jacket, the grinding-surfaces or dress of which are arranged in acertain manner, as will be hereinafter more fully described. A longpendent plate curved at its lower end to provide a concave and havingasimilar grinding-surface arranged thereon is mounted within each of thecompartments adjacent to and partlyinclosing the grinding-rollers,andthese plates or concaves are adjustable independently of each other in asimple and effective manner. A conveyer extends upward from the bottomof one compartment and is adapted to discharge the contents thereof intothe upper portion of the adjacent compartment, where the contents arereground and then discharged.

The invention also consists in providing a casing of peculiarconstruction, whereby the grinding-surfaces may be readily inspected.

The invention also consists in the further novel construction andcombinations of parts hereinafter more fullydescribed and claimed, andillustrated in the accompanying drawings, showing the invention, and inwhich- Figure l is a front elevation of our improved grindingmill. Fig.2 is a side elevation thereof. Fig. 3 is a front elevation with thehopper broken away and the front plates removed. Fig. 4 is a verticaltransverse section through the mill. Fig. 5 is a detail view of thegrinding-surface. Fig. (3 is a detail longitudinal section thereof. Fig.7 is a detail transverse section of the same. Fig. 8 is a detailperspective view of the surface. Fig. 9 is a vertical section of one ofthe bearings of the roller-shaft.

Referring to the said figu res by numerals of reference, 1 is al'n'acket-frame of suitable construction which is adapted to be securedto the wall of a building or any other suitable structure. Mounted uponthis frame is a preferably metallic casing 2, secured thereto in anysuitable manner and provided at its upper end with a hopper 3, having aremovable vertical partilion 4, located in the center thereof. Thecasing 2 is provided with a similar vertical partition 5, extending tothe bottom thereof and forming two similar compartinents 6 and 7,respectively, within each of which is secured a long depending plate 8,which is outwardly curved at its lower end to provide a concave J andprovided upon its upper side with a grinding-surface 10, substantiallyof the form hereinafter more fully described. The depending plates areeach provided with a rearwardly-extending pin 11, which passes throughan opening formed in the supporting-block 1i, secured to the frame 1,and is adapted to bear upon the inner surface of an inclined strip 12,hinged to said frame at one end and secured at its opposite end to a rod13, extending along one side of the casing-2 and adapted to projectthrough the end of a cross-strip 14, which extends across the face ofthe casing, as shown, and is secured to the front block lat", mountedupon the frame 1. A suitable thumb-nut, as 15, is mounted thereon,whereby the same may be adjusted backward or forward, as desired. Theinclined strips 12 cross each other, as shown.

Journaled within suitable bearings 16, (one of which is shown in sectionin Fig. 9,) secured to the front block 14", is a shaft 17,wl1ich extendsthrough the sides of and the partition within the casing 2, and mountedupon this shaft within each compartment 6 and 7 is a roller 18, formedof suitable metal, as castiron, and upon which is mounted a cylindricalcase or jacket 19, preferably formed of hardened steel and secured tosaid roller by means of a pin 20, which projects therethrough and intoengagement with the shaft 17 of the device. These cases or jackets, aswell as the concave of the plate 8, are each provided with agrinding-surface or dress of zigzag construction.Thesegrinding-surfaceshaveincisions and ridges struck up on one side ofthe incisions and are arranged in parallel series and extend diagonallyin opposite directions alternately, as shown in Figs. 5, 6, 7, and 8.The grinding-surfaces on both therollers and concaves are formed bycuttingincisions into the surface of the cylindrical cases and concaves,and thereby forcing the metal up above the surfaces at one side thereof.The incisions being formed in diagonal parallel series and each seriesinclined alternately in opposite'direction. ,the ridges produced on oneside of each incision prevent the grain when being ground from spreadingtoward the sides of the compartments. A pulley 21 mounted upon the shaft17 and is adapted to impart motion through a belt or other suitabledevice 22 to a second pulley 23, mounted upon a shaft 24, which projectsinto the bottom of a conveyer 25, of suitable construction, which isarranged at the rear of the frame I and eX- tends to a point above thehopper 5 and is provided with a spout 26, whereby material dischargedtherefrom will be fed into one of the compartments 7 of the device.Motion may be imparted to the shaft through a pulley 27, mounted at oneend thereof, and a suitable fly-wheel, as 28, may also be securedthereto, whereby the pOWGttllFtY be controlled and the motion of themill rendered steady.

The removable partition 4 of the hopper 3 is grooved upon opposite sidesat its lower edge for the reception of the edges of sliding plates 29,the outer edges of which bear upon the inner surface of the casing 2 atthe bottom of the hopper. These plates extend through the front of thecasing and are provided with downwardlyturned edges 30, whereby the samemay be readily grasped and moved back or forth to regulate the amount ofmaterial fed to the grinding-s11 rfaces.

The front of the casing is preferably provided with a plate 31, which ispreferably hinged thereto in any suitable manner and locked in closedposition by means of a springcatch 32, as shown.

In operation grain is fed into the hopper of compartment 6, and the flowthereof into the compartment isregulated by the sliding plate 29, as isobvious. It will be understood that the grain will fall between adepending plate 8 and its concave 9 and the grinding-roll, which as itrevolves in the direction of the arrow shown in Fig. 4 will grind thesame by means of the grinding-surfaces thereon. By providinggrinding-surfaces of the con= struction heretofore described a shiftingmovement is imparted to the grain during the operation of the mill,which, as is obvious, gives a side as well as a rotary movement to thegrain, and will thereby prevent clogging thereof. By this constructionheating of the grain is also prevented, because of the rapidity withwhich it is discharged. The grain passing between the plate and rolleris discharged into the bottom of the conveyer 25 through a spout 33 andis conducted thereby upward to a point above the hopper 3 and dischargedinto a second spout 26, which conveys the grain into the hopper of theadjoining compartment f the device. The operation of grinding Withinthis hopper is similar to that hereinbefore described, and the grainpasses outward therefrom into any suitable receptacle which-may beprovided therefor.

By adjusting the strips 12 from or toward the frame 1 of the device theplates 8, together with the pins 11 thereof, are adjusted in relation tothe rollers 18, and it is obvious that by this arrangement the grain maybe ground to any suitable fineness;

The operation hereinbefore described should only be employed when it isdesired to secure a very fine product. Where coarse grinding is to bedone, the partitions 4 and 5 may be omitted from the device and thegrain ground by one operation and without em ploying the conveyer 25.

By providing the hinged cover 31 the grinding-surfaces may be readilyinspected. The key 20, as before described, detachably secures the caseor jacket 19 and the roller 18 to the shaft of the device, and the samemay therefore be readily removed when it is desired tosharpen thegrinding-surfaces or for any other reason.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is

A grinding-mill comprising a solid roller constructed with agrinding-surface having incisions and ridges struck up on one side ofthe incisions; the incisions and ridges being arranged in parallelzigzag lines transversely of the roller and a depending plateconstructed with a-curved lower end providing a concave formed with agrinding-surface having incisions and ridges struck up on one side ofthe incisions; the incisions and ridges being arranged in parallelzigzag lines transversely of the concave.

In testimony whereof We affix our signatures in presence of twowitnesses.

JOSEPH BERCHA. WASHINGTON I. CHAPMAN.

IVitnesses:

L. C. CHAPMAN, EBER LEEK.

